81110025 has 24 divisors (see below), whose sum is σ = 149003360. Its totient is φ = 43258320.

The previous prime is 81110023. The next prime is 81110027. The reversal of 81110025 is 52001118.

It is an interprime number because it is at equal distance from previous prime (81110023) and next prime (81110027).

It is not a de Polignac number, because 81110025 - 2¹ = 81110023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81110023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59407 + ... + 60756.

Almost surely, 2^81110025 is an apocalyptic number.

It is an amenable number.

81110025 is a deficient number, since it is larger than the sum of its proper divisors (67893335).

81110025 is a wasteful number, since it uses less digits than its factorization.

81110025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120182 (or 120171 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 81110025 is about 9006.1104257054. The cubic root of 81110025 is about 432.8706880240.

The spelling of 81110025 in words is "eighty-one million, one hundred ten thousand, twenty-five".